WSAL23459 – R800C GSM – GPRS HAT/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The R800C is a compact add-on board providing GSM and GPRS functionality for Raspberry Pi. It supports SMS, phone calls, data transfer via TCP/IP and HTTP. Control is through AT commands; the serial interface defaults to 115200 baud.

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WSAL23459 – R800C GSM/GPRS HAT For Raspberry Pi

Technical overview

Compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B
Frequency bands: EGSM 900 / PCS 1900 MHz, quad-band auto search available
GSM power class 4 (2 W at 850/900 MHz) or class 1 (1 W at 1800 MHz)
GPRS data rate up to 85.6 kbps, coding schemes CS-1 through CS-4
SMS storage on SIM card; supports MT, MO, CB, text, and PDU modes
Serial: two ports, default baud rate 115200 bps
AT commands per 3GPP TS 27.007, 27.005, plus SIMCOM extensions
Two LEDs (PWR and NET) indicate network registration and transmission status

Commands and examples – verify before use:

AT
ATE1
ATE0
AT+CSQ
AT+CGMR
AT+CREG?
AT+CGATT?
ATD<number>;
ATH
ATA
AT+CPIN?
AT+CLIP=1
AT+CMGF=1
AT+CMGS="<phone number>"
AT+CMGR=<index>
AT+CMGD=<index>
AT+CIPMUX=0
AT+CIPMUX=1
AT+CSTT="CMNET"
AT+CIICR

Notes and version constraints

Confirm network registration before attempting data transfer (AT+CREG?)
APN setting may vary by carrier; the example used "CMNET"
Transparent mode allows only a single connection; multi-link mode supports up to six connections
When using a third-party SIM card, verify PIN prompt and carrier parameters
The IP address and port values shown in the source are examples, not general configuration

Source and revision record

R800C GSM/GPRS HAT - Waveshare Wiki
Source revision: 90947
Captured: 2026-09-04T03:01:53+00:00
SHA-256: 8e9cc14a9ddd254662d6e1e7cd2679fd372bc119ff8ffb425986f2c8a8996c72